Combined furnace and flue-welder



F. JOHNSON. y COMBINED FURNACE AND FLUE WELDER.

I APPLICATION FILED APR. I6, |919. l I 1,346,753. Patented July 13,1920.

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COMBINED FURNACE AND FLUI WEIDER.

APPLICATION FILED APR. 'IIS i919.

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F. drol/mmm F. JOHNSON. COMBINED FURNACE AND FLUE WELDER.

APPLICATION FILED APR. I6, I9I9. I I

Patented July 13, 1920.

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FIDELIS JOHNSON, F DELFHOS, OHIO.

COMBINED FURNCE AND 1"]'1UE-VVELDIEHEL Application led April i6, 1919.

To all whom t may concern:

Be it known that l, Finnnis JOHNSON, a citizen of the UnitedStates,residing at Delplios, in the county of Allen and State of Ohio,have invented certain new and useful improvements in Combined Furnacesand Flue-Vielders, of which the following is a specification.

This invention relates to a combined furnace and flue Welder.

One object of my invention is to provide a device of this character inwhich the mandrel is stationary and does not whirl the flue during theprocess of welding and also inwhich the weldin roller rotates around theflue and mandrel c uring such process.

A further object of my invention is to provide for the use of mandrelsof different sizes whereby iiues of different diameters may be welded.

A still further object of my invention is to provide for the engagementof the flue with the mandrel by passing it through and without removingit from the heating furnace.

With the foregoing and other objects in view that will appear as thenature of the invention is better understood, the same consists in thenovel features ofV construction, combination and arrangement of partsillustra-ted in the drawings and more particularly pointed out in theappended claim.

In the accompanying drawings, in which like parts are designated by likecharacters throughout the several views Fgure 1 is a plan View of acombined furnace and flue Welder, embodying my improvements.

Fig. 2 is a side elevation thereof.

Fig. 3 is a similar view, with parts shown in section.

liig. 1 is a detail sectional view of the roller, its bearing head andassociated parts, all shown on an enlarged scale.

Fig. 5 is a detail face view of the sleeve used in coupling the leverarm of the welding roller to the hollow actuating shaft, the lattershown in transverse section and Fig. 6 is a detail perspective view.

Referring to the drawings for a more particular description of theinvention and which drawings are for illustrative purposes only and aretherefore not drawn to scale, the numeral 1 represents the supportingframe, 2 the furnace, 3 a downwardly inclined box or receptacle for thefuel, 4; the

Specification of Letters Patent.

Patented July 13,1920.

Serial No. 290,483.

blower, the blowerpipe leading to and communicating with the air chamber6 beneath the furnace, 7 the stationary mandrel and S the weldingroller. rlhe mandrel is removably secured to the inner or front end ofthe shaft 9 by one or more set screws 10 or other equivalent means. Theshaft 9 is held stationary or against rotation by the bracket 11,secured at one end, as at 12, to the frame 1, with its upper free endextending through a corresponding opening 13 in the adjacent end of saidshaft.

A hollow cylindrical drive sleeve 14 is revolubly mounted upon thestationary shaft 9 and extends from the rear end of the mandrel to theouter end of said shaft, said sleeve being journaled in lthe bearings15' and 16 mounted on top of the supporting frame .1. The sleeve 14 isdriven by a belt 17 passing over a pulley 18 keyed to the outer end ofthe sleeve and over a second smaller .pul-- ley 19 keyed to thecountershaft 20, journaled in suitable bearings, as 21, of thesupporting frame. The shaft 2O is provided with a fast and loose pulley'22 and 23, respectively, and is driven by a belt (not shown) leading toa gasolene engine, inotor, or other source of power. The belt used indriving the shaft 2OV is shifted from the fast to the loose pulley, orvice versa, by the belt shifter 211. The blower is driven by the beltwhich `passes over a relatively large pulley 26 on the shaft 2O yandover a second smaller pulley 27 carried by the blower shaft 28. y Thewelding rollei' 8, which is preferably of solid cylindrical form, isjournaled between the outwardly projecting ears or lugs 29of the bearinghead 30, which is adjustably secured by the bolt and nut 31and 32,respectively, or other equivalent means, to the longitudinally slotted,outwardly and iight-angularly bent portion 33 of the lever arm 3&1,which is disposed in ahorizontal position. T he outer end of theright-angularly bent portion of said lever arm terminates in anoutwardly bent extension 35 and working through said extension andengaging the bearing head 30, is a set screw 36, which may be locked inadjusted position by the lock nut 37 and prevents outward displacementof the welding roller 8k during the welding process. rEhe lever arm 34kis fulcriimed intermediate its ends, as at 38, between anyone pair ofthe outwardly and iio radially projecting extensions or ribs 39 l formedon the outer surface of the hollow cylindrical coupling sleeve 40, whichis keyed to and rotates with the drive sleeve 14. The lever arm 34 isformed Vwith an inwardly curved outer end 41 adapted to be engaged by acone 42 slidably mounted on the sleeve 14 and adapted to be moved in onedirection by the foot treadle 43, pivoted, as at 44,' to the frame 1 andprovided at the upper end of its vertical portion, with a yoke 46, whichhas a slot and stud connection, as47, with said cone. v

My machine is used in the welding of boiler tubes or fines and for thesake of explanation, it will be stated that in removing boilerflues fromthe boiler to be cleaned, it is necessary to'cut off the ends of theflues, and hence, in order to replace the same flues, they must belengthened by welding a short piece of tubing, usually five or sixinches 1n length, on each flue.

In practice, the flue with the section or piece of tubing as 48, to bewelded thereon, is placed in the furnace by inserting through theopening 49 in the front wall thereof, until the outer end of saidsection or piece abuts against or engages the abutting plate 50, carriedby the upright arm 51 of the rock shaft 52, journaled to the supportingframe 5.3 above the discharge end of the blower pipe 5. A horizontallydisposed hand lever 54 is connected to one end of said rock shaft and isheld in horizontal position by the latch 55. After the flue with thepiece or section of tubing to be welded thereon has beenheated in thefurnace to the' required temperature, the hand lever 54 is lraised tolower or shift the abutting plate into a horizontal out-of-the-wayposition, as indicated in Fig. 3. The flue, together with the piece orsection of tubing to be welded thereon, is then passed through theopening 56 in the back wall of the furnace and passed over and adjustedon the mandrel 8, also as shown in VFig. 3. The drive Vsleeve 14 havingbeen previously set Vin motion by applying the' power, the weldingroller 8 will be swung outwardly away from the mandrel by centrifugalforce, leaving Vsuiiicient space between the roller and mandrel` for theadjusting of the flue on the latter, as previously described. rIhe flue,with the piece or section of tubing to be welded thereon having beenpassed over the mandrel, the cone 42 is slid or moved forwardly on thedrive sleeve 14 by depressing the foot treadle 43 against the action ofthe coil springs 57, the tendency of which are to hold the 'cone inretracted or inoperative position. This operation throws the roller 8in, which rotates around the mandrel and works over the flue at thejoint at the pressure required. During the welding process,

the rotating action of the roller S, will cause the flue to graduallyturn approximately three-quarters of a revolution around the. A.

mandrel, which gives the operator a clear vision of the weld around theflue joint,V

that is, at the point of connection of the Y the heat generated by thefurnace may be regulated by the operator to meet the requirements, as isapparent, or the air blast from the blower entirely shut off.

In using my furnace there will be no fire glare to injure the eyes orany great heat to which the operator will be exposed, as in the ordinaryflue weldingv fires. The furnace is preferably lined with common firebrick and can be relined when required.

Different sized mandrels may be used for different size flues, rangingfrom 1 and 1- to 4 inches in diameter. Y

From the foregoing description taken in 'connection with the drawings,it is thought that the construction, operation and advantages of myinvention will be readily under stood without requiring a more extendedexplanation. i

Variouschanges in the form, proportions and minor details ofconstruction may be resorted to without departing from the principles orsacrificing any of the advantages of this inventionV as defined in theappendedY claim.

Having described my invention, what I claim as new and desire to secureby Letters Patent, is Y In a machine of the character specified, asupporting frame, a hollow cylindrical drive sleeve ournaled thereon, astationary shaft extending through and beyond one end of the drivesleeve, a stationary mandrel, removably secured to the projecting end ofsaid shaft, a lcoupling member keyed to the inner end of the Vdrive'sleeve and rotating therewith, a roller mounted to revolve around themandrel and over the en-d of a flue to be welded, a horizontally ioodisposed lever arm fulcrumed to the cou- V- FIDELIS JOHNSON.

